A valid passport is required for all passengers (even infants!).
Without a passport, you will not be permitted to board your flight to Jamaica.

Recommended for US travelers: Passport Card -- Us Dept. of State

Embassy of Jamaica in the U.S.A.
1520 New Hampshire Ave. NW,
Washington, D.C. 20036
tel (202) 452-0660.

If you have questions about passport or visa requirements, or are a citizen of another country, you can call 1-800-233-4582 (Jamaica Tourist Board).